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Degradable PAM hydrogel mediated by hydroxy acids for temporary plugging 认领 引用
1
作者 Ren-Jing Ji Xiao-Rong Yu +5 位作者 Zhi-Xiang Xu Xian-Qun Wang Jia-Yu Tan Yong-Quan Han Huan Yang Gao-Shen Su 《Petroleum Science》 SCIE EI CAS CSCD 2026年第3期1543-1552,共10页
In this study,the degradation time of gel plugs was regulated by introducing hydroxy acids to adjust the crosslink density,effectively addressing the challenge of controllable degradation time in existing gel plugs.Th... In this study,the degradation time of gel plugs was regulated by introducing hydroxy acids to adjust the crosslink density,effectively addressing the challenge of controllable degradation time in existing gel plugs.The degradation time of the self-degradable gel plug(SDGP)was extended from 53 h without acid to 235 h with the addition of tartaric acid.Notably,the introduction of hydroxy acids not only regulated the degradation time of the SDGP but also enhanced its properties.The breakthrough pressure of the SDGP without acid was 0.53 MPa,while that of the SDGP with citric acid was 0.74 MPa.Additionally,self-degradation of the SDGP could be achieved after maintaining high strength for a period,ultimately degrading to a liquid with a viscosity of less than 200 mPa·s.The introduction of hydroxy acids increased the crosslinking density between polymer chains and reduced the internal free water content,thereby slowing the hydrolysis of ester groups to achieve controlled degradation of the SDGP.Furthermore,when the crosslinker poly(ethylene glycol)diacrylate was hydrolyzed,the hydroxy acids acted as a crosslinker to re-crosslink the polymer chains,with both the hydroxyl and carboxyl groups in the hydroxy acids participating simultaneously.This study provides a novel approach to adjusting crosslink density to regulate the degradation time of temporary plugging polymer gels,which avoids subsequent gel-breaking operations,reduces costs,and simplifies the operation process. 展开更多
关键词 Temporary plugging Self-degradable gel plug Controlled degradation Hydroxy acid Pressure resistance performance
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Effect of porous and slot plug clogging on bubble size distribution, mixing time, and slag eye in a ladle furnace 认领 引用
2
作者 Ning Wang Zhong-Qiu Liu +3 位作者 Yu-Chao Yao Jia-Qi Zhao Jian-Chao Ma Bao-Kuan Li 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第2期104-115,共12页
A 1:4 water model experimental platform was established based on a 135 t dual-plug bottom-blowing ladle.The plugs used were of a porous-type and two slot types(slot Ⅰ and slot Ⅱ).Bubble distribution,mixing time,and ... A 1:4 water model experimental platform was established based on a 135 t dual-plug bottom-blowing ladle.The plugs used were of a porous-type and two slot types(slot Ⅰ and slot Ⅱ).Bubble distribution,mixing time,and slag eye in the ladle’s multiphase system under various clogging ratios were investigation.Solutions were proposed to mitigate the negative impact of clogging on refining efficiency.The results indicate that the clogging of plugs significantly affects both the number and diameter distribution of bubbles,with the porous-type plug being the most affected.When the clogging percentage reaches 3/4,the maximum bubble diameter in the porous-type plug group is significantly larger than that in the slot-type plug group,and a large number of small-diameter bubbles are produced due to fragmentation.When there is no clogging,the slot Ⅰ plug group shows the shortest mixing time,while the slot Ⅱ plug group has the longest.After clogging,increasing the flow rate by 50 L/h can counteract the negative impact on mixing time in the porous-type and slot Ⅰ plug groups,while a larger increase is required for the slot Ⅱ plug group.The slag eye area decreases as the clogging percentage increases.When the clogging percentage reaches 3/4,the slag eye area for the porous,slot I,and slot Ⅱ plugs decreases by approximately 24%,14%,and 17%,respectively,and the fluctuation in the slag eye area increases significantly.This can be used as an indicator to assess the degree of clogging. 展开更多
关键词 Ladle Porous-type plug Slot-type plug Mixing time Clogging
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Interfacial plugging of shale microfractures using functionalized graphene oxide with high dispersion stability under harsh conditions 认领 引用
3
作者 Dao-Xiong Li Yang Bai +5 位作者 Cheng Wang Na Su Ling-Feng Wu Deng Gu Yu-Fen Zhai Ping-Ya Luo 《Petroleum Science》 SCIE EI CAS CSCD 2026年第1期422-433,共12页
Shale gas development often suffers from wellbore instability due to microfractures in the formation,posing serious challenges to drilling safety and efficiency.This study presents a functionalized graphene oxide(GO-P... Shale gas development often suffers from wellbore instability due to microfractures in the formation,posing serious challenges to drilling safety and efficiency.This study presents a functionalized graphene oxide(GO-PAA)nanomaterial,prepared by grafting hydrophilic polyacrylic acid(PAA)chains onto GO surfaces to enhance dispersion stability under high salinity,elevated temperature,and wide pH conditions.The results indicate that GO-PAA effectively resists charge-shielding effects under conditions of high salinity,elevated temperature,and a wide pH range,significantly reducing the risk of particle aggregation.Even at high salt concentrations,the zeta potential remains below-32.8 mV,demonstrating good colloidal stability.Plugging performance was evaluated using simulated core experiments.GO-PAA fo rmed a"band-aid"like barrier on shale microfracture surfaces,reducing permeability by up to57.53%,nearly twice that of conventional spherical nano particles.Scanning electron microscope(SEM)and elemental analysis confirmed the formation of a dense and uniform plugging layer.The synergistic interaction between GO's 2D lamellar structure and the flexible polymer chains facilitated effective surface adhesion and coverage.This adsorption-adhesion plugging mechanism represents a shift from traditional bridging theories,enabling reduced material usage and improved efficiency.The findings provide theo retical and practical support for designing high-perfo rmance nanoplugging agents in waterbased drilling fluids,contributing to safer and more sustainable shale gas development. 展开更多
关键词 Functionalized GO Stable dispersion Interfacial plugging Nanoplugging agent Shale microfractures
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Analysis of solidification process and gas sealability of Sn58Bi alloy plugging casing 认领 引用
4
作者 Chun-Qing Zha Wen-Chao Tao +1 位作者 Gong-Hui Liu Wei Wang 《Petroleum Science》 SCIE EI CAS CSCD 2026年第4期2275-2287,共13页
The Sn58Bi alloy plug,composed of 58%bismuth(Bi)and 42%tin(Sn),emerges as a promising alternative to conventional cement plugs.Investigating its mechanical behavior throughout the molten-tosolidified transition is cru... The Sn58Bi alloy plug,composed of 58%bismuth(Bi)and 42%tin(Sn),emerges as a promising alternative to conventional cement plugs.Investigating its mechanical behavior throughout the molten-tosolidified transition is crucial for predicting its performance in downhole oil and gas applications.Particular emphasis was placed on characterizing early expansion behavior during solidification,as the magnitude of expansion force directly correlates with sealing integrity.To analyze temperature and expansion force dynamics during plug formation,a specialized experimental apparatus was developed.Expansion and sealing integrity tests revealed three key findings:Applying overlying axial pressure(0–2 MPa)significantly enhanced plug sealing capacity,with a linear relationship observed between sealing performance and pressure magnitude.In addition,slower and more uniform cooling facilitated expansion both radially and at the axially constrained bottom.Increasing the length-to-diameter ratio(L/D)of 2–6 induced sequential solidification patterns,wherein final-stage solidification drove radial expansion of residual molten alloy,thereby improving gas sealing integrity.These findings establish a theoretical framework for the application of Sn58Bi alloy as downhole casing-plug material. 展开更多
关键词 Sn58Bi alloy plug Expansion force Sealing integrity Casing-plug materials
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A high-temperature and high-strength polymer gel for plugging in fractured formations 认领 引用
5
作者 Yuan Liu Ying-Rui Bai +4 位作者 Jin-Sheng Sun Kai-He Lv Jing-Bin Yang Ke-Qing Yang You-Ming Lang 《Petroleum Science》 SCIE EI CAS CSCD 2026年第4期1955-1969,共15页
Lost circulation,the significant penetration of drilling fluid into formations during drilling,leads to excessive fluid consumption,non-productive time,and potential well control incidents.This study developed a tunab... Lost circulation,the significant penetration of drilling fluid into formations during drilling,leads to excessive fluid consumption,non-productive time,and potential well control incidents.This study developed a tunable polymer gel system for plugging lost circulation zones of various scales.Its mechanical properties can be controlled by adjusting the concentration,temperature,gelling time,and aging time.At 120℃and 10 h gelling time,increasing concentration from 12%to 20%steadily enhanced mechanical properties:storage modulus rose from 750 to 3171 Pa,and tensile stress increased from 20.03 to 67.8 kPa.However,under different temperature and time regimes,the mechanical properties of polymer gels first strengthened and then weakened or showed a trend of strengthening,weakening,and then strengthening again.For example,under gelling temperature 120℃and 14%concentration,when the gelling time was increased from 4 to 10 h,the tensile stress of polymer gel increased from 4.103 to 30.07 kPa,but when the gelling time was further extended from 10 to 12 h,the tensile stress was reduced from 30.07 to 11.33 kPa.With further extension of time to 14 h,the tensile stress increased again to 43.91 kPa.Comprehensive microstructural analysis revealed how these factors influence gel properties.Subsequently,the simulated plugging experiments of fractures and sand-filled pipes were conducted using the polymer gel with a concentration of 14%and a temperature of 140℃for 8 h,and the plugging strength was 5.8 MPa for the parallel fracture of 5 mm,and 10.06 MPa for the sand-filled pipe with a 3 mm fracture and an inner diameter of 3 cm in the outlet pipe,which indicated that the polymer gel system exhibited strong pressure-bearing plugging ability for both the fracture and the fracture/vuggy.The proposed polymer gel was applied in the field of HD29-H8 well in the Tarim Basin of Xinjiang,China,and successfully plugged the loss formation above 5000 m,which demonstrated that it can effectively plug high-temperature and high-pressure reservoirs. 展开更多
关键词 Polymer gel Plugging Fracture Temperature Mechanical properties
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Double-crosslinked self-degradable hydrogel for temporary plugging in low temperature reservoirs 认领 引用
6
作者 Tai-Heng Yin Yu-Meng Zhu +6 位作者 Yu-Qi Yang Shen-Gen Chen Ji-Rui Chen Yuan-Yuan Lu Han-Yu Guo Tao Wan Jian Liu 《Petroleum Science》 SCIE EI CAS CSCD 2026年第3期1402-1415,共14页
Temporary plugging agents are critical to oilfield operations such as diversion fracturing,wellbore interventions,and drilling.This study develops a double-crosslinked self-degradable gel(DSDG)using polydopamine and p... Temporary plugging agents are critical to oilfield operations such as diversion fracturing,wellbore interventions,and drilling.This study develops a double-crosslinked self-degradable gel(DSDG)using polydopamine and poly(ethylene glycol)diacrylate as crosslinkers for polyacrylamide,targeting low temperature reservoirs.The DSDG system integrates covalent crosslinking via C=C bonds and dynamic crosslinking through amine–catechol interactions.Gelation kinetics,rheological properties,self-degradation mechanisms,and gel breaking performance of DSDG were systematically characterized.By analyzing the influence of components on gelation kinetics and mechanical properties,the composition of DSDG was optimized to include 4–8 wt%acrylamide monomer,0.5–0.8 wt%initiator,and 0.2–0.6 wt%poly(ethylene glycol)diacrylate crosslinker,with a dopamine to acrylamide mass ratio of(5–8)×10−3.At 60–80℃,DSDG transitions from liquid to quasi-solid gel within 30–180 min,with>80%of the gelation process occurring in a low viscosity phase conducive to pumpable injection.Unoxidized catechol groups,π–πstacking,and hydrogen bonding synergistically enhance tensile strength,fracture toughness,and interfacial adhesion,enabling robust sealing under downhole stresses.Core flooding tests in 5–50 mD cores achieved initiation and breakthrough pressure gradients of 34.6–119 and 86.6–184.6 MPa/m,respectively.In simulated wellbore with an inner diameter of 120 mm,the pressure-bearing capacity reached 1.25 MPa/m.Acidic/alkaline conditions rapidly degrade polydopamine,disrupting network integrity and enabling controllable gel breaking times of 1–20 d.Free dopamine monomers inhibit acrylamide polymerization,reducing post-degradation viscosity to<10 mPa·s via shortened polyacrylamide chains. 展开更多
关键词 Self-degradable Double-crosslinked hydrogel Polydopamine Low temperature reservoir Temporary plugging agent
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Enhancing fracture uniformity in hydraulic fracturing:A 3D simulation study on natural fracture networks and plugging optimization 认领 引用
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作者 Xingyi Wang Xin Chang +3 位作者 Chunhe Yang Yintong Guo Haijun Mao Xilin Shi 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第7期5505-5523,共19页
The non-uniform propagation of multi-cluster fractures during the hydraulic fracturing of deep shale gas reservoirs is an ongoing challenge.The dynamic interaction between natural fracture networks and in-situ stress ... The non-uniform propagation of multi-cluster fractures during the hydraulic fracturing of deep shale gas reservoirs is an ongoing challenge.The dynamic interaction between natural fracture networks and in-situ stress fieldsstrongly affects fracture propagation,decreasing fracturing efficiency.In this study,a 3D discrete lattice numerical simulation is employed to systematically analyze the dynamic regulatory mechanisms of multi-cluster fracture propagation under the combined effects of natural fracture characteristics,differential in-situ stress,and temporary plugging strategies.The goal is to optimize temporary plugging parameters for balanced fracture extension.The results reveal that increasing the natural fracture density and size reduces the average hydraulic fracture length while markedly mitigating stress shadowing effects.A greater difference in horizontal in-situ stress intensifiesthe interfracture stress,suppresses natural fracture activation and decreases mechanical interference.Ballsealing temporary plugging effectively limits the excessive growth of dominant outer fractures.As the number of plugging balls increases,the fracture length differentiation coefficientdecreases but then increases,with the optimal plugging timing identifiedat 37.5% of the total fracturing duration.Singlestage plugging achieves a better fracture length differentiation coefficientthan two-stage plugging does.Field applications require multi-stage plugging to increase operational tolerance,which requires proportional increases in the number of plugging balls.The established optimization criteria for temporary plugging parameters provide a theoretical basis for increasing the development efficiencyof deep shale gas reservoirs. 展开更多
关键词 Deep shale Hydraulic fracturing Natural fracture Temporary plugging optimization Discrete lattice model
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Experimental Development and Optimization of a Particle-Fiber-Powder Composite Temporary Plugging System for Diversion Fracturing 认领 引用
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作者 Xiaoyong Wen Hongjiang Zou +7 位作者 Zhiwen Li Jianan Li Chengwang Wang Yugong Wang Wenxiong Wang Fa Yang Hanxi Peng Zhenglan Li 《Fluid Dynamics & Materials Processing》 EI 2026年第7期195-213,共19页
This study develops a particle-fiber-powder composite temporary plugging system and systematically investigates the dynamic plugging behavior of single-component,binary,and ternary formulations to elucidate the mechan... This study develops a particle-fiber-powder composite temporary plugging system and systematically investigates the dynamic plugging behavior of single-component,binary,and ternary formulations to elucidate the mechanisms governing plug formation and optimize material composition for diversion fracturing applications.Conventional temporary plugging materials often exhibit inadequate plug formation,limited pressure-bearing capacity,and poor plugging stability,compromising stimulation effectiveness in heterogeneous reservoirs.Experimental results show that neither the particle-only nor the particle-powder system can establish a stable load-bearing structure,resulting in poor plugging performance.In contrast,fiber incorporation fundamentally transforms weak particle bridging into a mechanically stable plug,with a distinct concentration threshold governing this transition.The addition of powder to the particle-fiber system further accelerates plug formation and enhances plug compactness by reducing pore connectivity.Among the formulations investigated,the ternary system containing 1 wt% particles,0.5 wt% fibers,and 4 wt% powder exhibits the highest pressure-bearing capacity,achieving a maximum plugging pressure of 13.97 MPa,whereas increasing the powder concentration to 5 wt% produces the shortest plug formation time.Based on these findings,a synergistic plugging mechanism is proposed in which particles form the primary load-bearing skeleton,fibers reinforce and stabilize the particle framework,and powder densifies the pore structure to improve sealing integrity. 展开更多
关键词 Hydraulic fracturing composite temporary plugging system temporary plugging and diversion fracturing formulation optimization diversion pressure
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Preparation and performance evaluation of self-degrading core-shell structure temporary plugging agent 认领 引用 被引量：1
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作者 Jia-Rui Li Ling Lin +4 位作者 Lei Li Hao Lu Cheng-Yuan Xu Xin-Min Zhang Wen Ren 《Petroleum Science》 SCIE EI CAS CSCD 2026年第4期2017-2029,共13页
Temporary plugging agents(TPAs)are widely used in oilfield development due to their self-removal after operations and their minimal effect on reservoirs.However,the current methods used to remove TPAs may damage the r... Temporary plugging agents(TPAs)are widely used in oilfield development due to their self-removal after operations and their minimal effect on reservoirs.However,the current methods used to remove TPAs may damage the reservoir.To address this,a self-degradable TPA for 120℃conditions was prepared and tested in this study.Using acrylamide(AM)as the base monomer,along with polyethylene glycol diacrylate(PEGDA)and N,N′-methylenebisacrylamide(MBA)as crosslinkers,a crosslinked shell was synthesized.The degradation time of this shell can be adjusted by changing the ratio of two crosslinking agents.The shell served as a shielding layer to encapsulate polylactic acid(PLA),thereby delaying the latter's degradation.Experimental results confirmed that the TPA had a core–shell structure and exhibited good compatibility with base slurry.At a concentration of 0.5%,it effectively reduced filtration volume of base slurry.Furthermore,the TPA showed favorable plugging performance and pressure-bearing capacity.As the ratio of the two crosslinking agents varied,the water absorption capacity of the TPA exhibited an increasing trend,and its degradation duration at 120℃ranged from 60 to 72 h.FT-IR and SEM analyses revealed structural changes of the TPA in the degradation process.All test results demonstrated that degradation primarily occured through the cleavage of amide and ester bonds,leading to the rupture of crosslinking points. 展开更多
关键词 Shielding temporary plugging Self-degradation Core-shell structure Polylactic acid
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Experimental study of leakage characteristics and microscopic mechanisms in the sealing plug areas of underground compressed air energy storage caverns 认领 引用
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作者 Zizheng Dang Bing Zhang +4 位作者 Hanpeng Wang Qianzi Du Jianguo Fan Jiancai Sui Zhongzhong Liu 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第5期997-1020,共24页
To investigate the leakage mechanism of the sealing plug area in compressed air energy storage(CAES)caverns under various conditions,the leakage evolution characteristics of the simulated samples were systematically s... To investigate the leakage mechanism of the sealing plug area in compressed air energy storage(CAES)caverns under various conditions,the leakage evolution characteristics of the simulated samples were systematically studied via a self-developed triaxial seepage testing system.Combined with CT scanning,the development and propagation mechanisms of internal defects were elucidated.The results indicate that the leakage index is significantly positively correlated with the peak air pressure and injection rate but negatively correlated with the confining pressure.Leakage behavior during the charging phase is governed primarily by the peak pressure and injection rate,whereas that during the storage phase is predominantly controlled by the pressure magnitude.A distinct time lag,dominated by peak pressure,was identified between the leakage index and pressure characteristic points.The average peak leakage rate exhibited a“decreasing-then-increasing”trend,transitioning from an initial value of 9.3289 to 7.3267 cm3/s and then rebounding to 8.8093 cm3/s.The cyclic process enhanced the connectivity of the pore-fracture network;fracture coalescence reduced the number of large pores(>0.9 mm)but increased the total pore count.This research provides valuable insights for evaluating the sealing performance and rock concrete interface seepage of artificial CAES caverns. 展开更多
关键词 Compressed air energy storage(CAES) Sealing plug Leakage assessment Crack pore coupled leakage mechanism Microscopic defect development
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Temporary plugging agent transport behavior within visualized multi-fracture created during TPDF in a horizontal well: An experimental study 认领 引用
11
作者 Yu-Shi Zou Dian-Yu Li +4 位作者 Can Yang Yan-Chao Li Shi-Cheng Zhang Long-Qing Zou Xin-Fang Ma 《Petroleum Science》 SCIE EI CAS CSCD 2025年第9期3671-3687,共17页
Temporary plugging and diversion fracturing(TPDF)is widely used to promote the uniform and complex distribution of multi-clustered hydraulic fractures(HFs)in a horizontal well of the unconventional formations.However,... Temporary plugging and diversion fracturing(TPDF)is widely used to promote the uniform and complex distribution of multi-clustered hydraulic fractures(HFs)in a horizontal well of the unconventional formations.However,the migration behavior of temporary plugging agent(TPA),as a function of the concentration and particle size of TPA and cluster-perforation numbers,etc.,determining the effectiveness of this technique,remains unclear.Therefore,this study conducted innovatively a series of TPDF simulation experiments on transparent polymethyl methacrylate(PMMA)specimens(cubic block of 30 cm×30 cm×30 cm)to explore visually the migration behavior of TPA in multi-clustered HFs in a horizontal well.A laboratory hydraulic sandblasting perforation completion technique was implemented to simulate the multi-cluster perforations.All the distributions of wellbore,perforations,HFs,and TPA can be seen clearly inside the PMMA specimen post the experiment.The results show that there are four characteristic plugging positions for the TPA:mouth of HF,middle of HF,tip of HF,and the intersection of HFs.Small particle size TPA tends to migrate to the fracture tip for plugging,while large particle size TPA tends to plug at the fracture mouth.The migration of the TPA is influenced obviously by the morphology of the fracture wall.A smooth fracture wall is conducive to the migration of the TPA to the far end of HFs,but not conducive to generating the plugging zone and HF diversion.In contrast,a"leaf vein"fracture of rough wall is conducive to generating the plugging layer and the diversion of HFs,but not conducive to the migration of the TPA to the far end of HFs.The migration ability of TPA in a"shell"pattern is intermediate between the two above cases.Increasing TPA concentration can encourage TPA to migrate more quickly to the characteristic plugging position,and thereby to promote the creation of effective plugging and subsequently the multi-stage diversion of the HFs.Nevertheless,excessive concentration may cause the TPA to settle prematurely,affecting the propagation of the HFs to the far end.Increasing the number of clusters to a certain extent can encourage TPA to migrate into the HFs and form plugging,and promote the diversion.An evaluation system for the migration ability of granular TPA has been established,and it was calculated that when there is no plugging expectation target,the comprehensive migration ability of small particle size TPA is stronger than that of large particle size TPA.This research provides theoretical foundation for the optimization of temporary plugging parameters. 展开更多
关键词 Temporary plugging and diversion fracturing(TPDF) Polymethyl methacrylate(PMMA) Multi-cluster perforation Temporary plugging agent migration Visualization Plugging position
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A thermoresponsive temporary plugging agent for drilling fluids in marine gas hydrate reservoirs:Synthesis,performance,and reversible plugging mechanism 认领 引用
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作者 Jin-tang Wang Ke Zhao +4 位作者 Bo Liao Lei Liu Kai-he Lü Jin-sheng Sun Shu-qiang Shi 《China Geology》 CAS CSCD 2026年第3期553-566,共14页
During drilling in marine gas hydrate reservoirs,drilling-fluid invasion can induce hydrate dissociation,wellbore instability,and reservoir damage,thereby compromising drilling safety and reservoir protection.To addre... During drilling in marine gas hydrate reservoirs,drilling-fluid invasion can induce hydrate dissociation,wellbore instability,and reservoir damage,thereby compromising drilling safety and reservoir protection.To address the low-temperature agglomeration and limited self-unplugging capability of conventional temporary plugging agents,a water-soluble thermoresponsive temporary plugging agent(TRP)was synthesized via free-radical copolymerization.Its structural characteristics,phase-transition behavior,plugging performance,reversible unplugging capacity,and underlying mechanism were systematically investigated through laboratory experiments and low-field nuclear magnetic resonance(NMR)imaging.The results show that TRP exhibits a lower critical solution temperature(LCST)of approximately 15℃,matching the thermal conditions of marine hydrate reservoirs.Above the LCST,TRP rapidly aggregates to form a dense plugging layer,effectively suppressing drilling-fluid invasion;below the LCST,it redissolves and restores formation permeability,with a maximum permeability recovery of 96.8%.Sanddisk filtration tests further demonstrate that TRP provides more effective fluid-loss control than ultrafine CaCO3 and nano-emulsion under the tested conditions.Low-field NMR imaging directly visualizes the invasion–plugging–unplugging process.Mechanism analysis indicates that plugging originates from hydrophobic association of polymer chains above the LCST,which enhances filter cake compactness and increases the rock-surface contact angle from 41.5°to 77.4°.This reversible thermoresponsive strategy provides a practical basis for intelligent reservoir protection during deep-sea hydrate drilling. 展开更多
关键词 Natural gas hydrates Combustible ice Clean energy Unconventional energy Gas hydrate reservoir Water-based drilling fluids Thermoresponsive polymers Temporary plugging agent Mechanism analysis Low-field nuclear magnetic resonance imaging Lower critical solution temperature
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Plugging mode of flaky lost circulation materials within fractures and mechanism to enhance pressure-bearing capacity for the plugging zone 认领 引用 被引量：1
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作者 Kun Guo Yi-Li Kang +3 位作者 Cheng-Yuan Xu Chong Lin Ling-Jie Zhang Li-Jun You 《Petroleum Science》 SCIE EI CAS CSCD 2025年第8期3315-3332,共18页
During drilling operations in deep fractured tight gas reservoirs,lost circulation of working fluid frequently occurs due to the formationʼs low pressure-bearing capacity.Adding lost circulation materials(LCMs)to dril... During drilling operations in deep fractured tight gas reservoirs,lost circulation of working fluid frequently occurs due to the formationʼs low pressure-bearing capacity.Adding lost circulation materials(LCMs)to drilling fluids is the most common method for controlling lost circulation.Among these,granular LCMs are widely used,but the application frequency of flaky LCMs has been increasing annually due to their unique morphology.However,the migration and plugging behavior of flaky LCMs within fractures,and the mechanisms enhancing the pressure-bearing capacity of the plugging zone are not well understood.Therefore,this study conducted visual plugging experiments and dynamic fracture plugging experiments to evaluate the plugging mode and pressure-bearing capacity of the plugging slurry with various particle sizes and concentrations of flaky LCMs.The experimental results demonstrate that the fracture plugging process can be divided into four stages:uniform flow stage of the plugging slurry,formation and development stage of the bridging area,formation and development stage of the plugging area,and pressure-bearing stage of the plugging zone.The inclusion of flaky LCMs notably reduces the duration of stages 1 and 2,while simultaneously increasing the proportion of the plugging zone and enhancing its surface porosity.Flaky LCMs reduce the effective fracture width through“interception”and“co-bridging”modes,thus improving plugging zone formation efficiency.Appropriate particle size and concentration of flaky LCMs increase the area and length of the plugging zone.This reduces the fracture width increment caused by injection pressure and enhances frictional force between the plugging zone and fracture surface,thereby improving the pressure-bearing capacity of the plugging zone.However,excessively high concentrations of flaky LCMs result in decreased structural stability of the plugging zone,and excessively large particle sizes increase the risk of plugging outside fracture inlet.The recommended concentration of flaky LCMs in the plugging slurry is 2%–3%,with a particle size 1.2 to 1.5 times that of the bridging granular LCMs and not exceeding twice the fracture width.This study provides a theoretical foundation for selecting LCMs and designing plugging formulations for field applications. 展开更多
关键词 Lost circulation Flaky lost circulation materials Fracture plugging zone Visualization Pressure-bearing capacity
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Experimental study of a circulation agent dynamic plugging for multi-scale natural fractures 认领 引用 被引量：1
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作者 Zhao-Wen Hu Yi-Qun Zhang +3 位作者 Jin-Shan Wang Xin-Yu Wang Yu Qin Ya Liu 《Petroleum Science》 SCIE EI CAS CSCD 2025年第9期3641-3654,共14页
Lost circulation critically jeopardizes drilling safety and efficiency,and remains an unresolved challenge in oil and gas engineering.In this paper,by utilizing the self-developed dynamic plugging apparatus and synthe... Lost circulation critically jeopardizes drilling safety and efficiency,and remains an unresolved challenge in oil and gas engineering.In this paper,by utilizing the self-developed dynamic plugging apparatus and synthetic cores containing large-scale fractures,experimental research on the circulation plugging of different materials was conducted.Based on the D90 rule and fracture mechanical aperture model,we analyze the location of plugging layer under dynamic plugging mechanism.By setting different parameters of fracture width and injection pressure,the laws of cyclic plugging time,pressure bearing capacity and plugging layers formation were investigated.The results show that the comprehensive analysis of particle size and fracture aperture provides an accurate judgment of the entrance-plugging phenomenon.The bridging of solid materials in the leakage channel is a gradual process,and the formation of a stable plug requires 2–3 plug-leakage cycles.The first and second cyclic plugging time was positively correlated with the fracture width.Different scales of fractures were successfully plugged with the bearing pressure greater than 6 MPa,but there were significant differences in the composition of the plugging layer.The experimental results can effectively prove that the utilized plugging agent is effective and provides an effective reference for dynamic plugging operation. 展开更多
关键词 Dynamic plugging Large scale fracture Lost circulation material Laboratory experiments Fracture aperture
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Structural formation and evolution mechanisms of fracture plugging zone 认领 引用 被引量：6
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作者 XU Chengyuan ZHANG Jingyi +5 位作者 KANG Yili XU Feng LIN Chong YAN Xiaopeng JING Haoran SHANG Xiangyu 《Petroleum Exploration and Development》 2021年第1期232-242,共11页
A coupled CFD-DEM method is used to simulate the formation process of fracture plugging zone.A photo-elastic system characterizing mesoscale force chain network developed by our own is used to model the pressure evolu... A coupled CFD-DEM method is used to simulate the formation process of fracture plugging zone.A photo-elastic system characterizing mesoscale force chain network developed by our own is used to model the pressure evolution in fracture plugging zone to reveal the evolution mechanism of the structure of fracture plugging zone.A theoretical basis is provided for improving the lost circulation control effect in fractured reservoirs and novel methods are proposed for selecting loss control materials and designing loss control formula.CFD-DEM simulation results show that bridging probability is the key factor determining the formation of fracture plugging zone and fracture plugging efficiency.Critical and absolute bridging concentrations are proposed as the key indexes for loss control formula design.With the increase of absolute bridging concentration,the governing factor of bridging is changed from material grain size to the combination of material grain size and friction force.Results of photo-elastic experiments show that mesoscale force chain network is the intrinsic factor affecting the evolution of pressure exerting on the fracture plugging zone and determines the macroscopic strength of fracture plugging zone.Performance parameters of loss control material affect the force chain network structure and the ratio of stronger force chain,and further impact the stability and strength of fracture plugging zone.Based on the study results,the loss control formula is optimized and new-type loss control material is designed.Laboratory experiments results show that the fracture plugging efficiency and strength is effectively improved. 展开更多
关键词 lost circulation formation damage control fracture plugging zone plugging zone structure plugging strength plugging efficiency CFD-DEM simulation photo-elastic experiment loss control material
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Enhancing uniformity of multi-fracture propagation by temporary plugging and diversion fracturing in a horizontal well with multicluster perforations 认领 引用
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作者 Xin Chang Shi-Long Teng +2 位作者 Xing-Yi Wang Yin-Tong Guo Chun-He Yang 《Petroleum Science》 SCIE EI CAS CSCD 2025年第9期3688-3708,共21页
Multi-stage and multi-cluster fracturing(MMF)is a crucial technology in unconventional oil and gas development,aiming to enhance production by creating extensive fracture networks.However,achieving uniform expansion o... Multi-stage and multi-cluster fracturing(MMF)is a crucial technology in unconventional oil and gas development,aiming to enhance production by creating extensive fracture networks.However,achieving uniform expansion of multi-cluster hydraulic fractures(HFs)in MMF remains a significant challenge.Field practice has shown that the use of temporary plugging and diversion fracturing(TPDF)can promote the balanced expansion of multi-cluster HFs.This study conducted TPDF experiments using a true triaxial fracturing simulation system setting a horizontal well completion with multi-cluster jetting perforations to investigate the equilibrium initiation and extension of multi-cluster fractures.The influence of key parameters,including cluster spacing,fracturing fluid viscosity,differential stress,and fracturing fluid injection rate,on fracture initiation and propagation was systematically examined.The results indicate that while close-spaced multi-cluster fracturing significantly increases the number of HFs,it also leads to uneven extension of HFs in their propagation.In contrast,TPDF demonstrates effectiveness in mitigating uneven HF extension,increasing the number of HFs,and creating a larger stimulated reservoir volume,ultimately leading to improved oil and gas well productivity.Moreover,under conditions of high differential stress,the differential stress within the formation exerts a stronger guiding effect in HFs,which are more closely aligned with the minimum principal stress.Low-viscosity fluids facilitate rapid and extensive fracture propagation within the rock formation.High-volume fluid injection,on the other hand,more comprehensively fills the formation.Therefore,employing lowviscosity and high-volume fracturing is advantageous for the initiation and extension of multi-cluster HFs. 展开更多
关键词 Non-uniformity of fracture propagation Temporary plugging and diversion fracturing Multi-cluster hydraulic fracturing Fracture propagation
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Enhanced Load-Settlement Curve Forecasts for Open-Ended Pipe Piles Incorporating Soil Plug Constraints Using Shallow and Deep Neural Networks 认领 引用
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作者 Luttfi A.AL-HADDAD Mohammed Y.FATTAH +2 位作者 Wissam H.S.AL-SOUDANI Sinan A.AL-HADDAD Alaa Abdulhady JABER 《China Ocean Engineering》 SCIE EI CSCD 2025年第3期562-572,共11页
This study investigates the load-bearing capacity of open-ended pipe piles in sandy soil, with a specific focus on the impact of soil plug constraints at four levels(no plug, 25% plug, 50% plug, and full plug). Levera... This study investigates the load-bearing capacity of open-ended pipe piles in sandy soil, with a specific focus on the impact of soil plug constraints at four levels(no plug, 25% plug, 50% plug, and full plug). Leveraging a dataset comprising open-ended pipe piles with varying geometrical and geotechnical properties, this research employs shallow neural network(SNN) and deep neural network(DNN) models to predict plugging conditions for both driven and pressed installation types. This paper underscores the importance of key parameters such as the settlement value,applied load, installation type, and soil configuration(loose, medium, and dense) in accurately predicting pile settlement. These findings offer valuable insights for optimizing pile design and construction in geotechnical engineering,addressing a longstanding challenge in the field. The study demonstrates the potential of the SNN and DNN models in precisely identifying plugging conditions before pile driving, with the SNN achieving R2 values ranging from0.444 to 0.711 and RMSPE values ranging from 24.621% to 48.663%, whereas the DNN exhibits superior performance, with R2 values ranging from 0.815 to 0.942 and RMSPE values ranging from 4.419% to 10.325%. These results have significant implications for enhancing construction practices and reducing uncertainties associated with pile foundation projects in addition to leveraging artificial intelligence tools to avoid long experimental procedures. 展开更多
关键词 pipe piles soil plug artificial neural network bearing capacity forecasts
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Preparation and Application of an Epoxy Soybean Oil-Based Plugging Agent 认领 引用
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作者 Yongming Li Dingyuan Zhang +1 位作者 Yadong Chen Jiandu Ye 《Fluid Dynamics & Materials Processing》 EI 2025年第2期261-277,共17页
Resin plugging agents play a pivotal role in addressing casing damage in oil and gas fields.However,the widespread use of epoxy resin is constrained by its high cost and non-renewable origin,while plant-based resins o... Resin plugging agents play a pivotal role in addressing casing damage in oil and gas fields.However,the widespread use of epoxy resin is constrained by its high cost and non-renewable origin,while plant-based resins often suffer from inadequate mechanical properties,which limit their effectiveness in such applications.This study introduces BEOPA,an innovative,renewable,high-strength resin plugging agent derived from epoxidized soybean oil(ESO)and enhanced with bisphenol A-type benzoxazine(BZ).In this study,the synthesis process,reactionmechanism,and application performance of this novelmaterial are systematically presented,explored and optimized.It is shown that the optimal formulation of BEOPA includes 41.4 wt%ESO,24.8 wt%BZ,24.8 wt%methylhexahydrophthalic anhydride(MHHPA),8.2 wt%styrene(ST),and 0.8 wt%N,N-dimethylbenzylamine(BDMA),yielding an impressive compressive strength of 93.7 MPa.The integration of ESO and BZ creates an intricate and robust double crosslinking network,significantly enhancing material strength and durability.BEOPA exhibits a tunable curing time,ranging from 0.5 to 15 h,with viscosities below 300 mPa⋅s at 25℃and 75mPa⋅s at 50℃.Furthermore,it demonstrates exceptional thermal stability within the 100℃-150℃range,even in environments with mineral salt concentrations as high as 43,330 mg/L.Remarkably,BEOPA achieves superior plugging performance,sustaining breakthrough pressures exceeding 29.7 MPa in 1 mm crack cores. 展开更多
关键词 Casing damage epoxidized soybean oil benzoxazine mechanical properties plugging properties
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Technology of milling bridge plugs and field applications in shale gas horizontal wells with severe casing deformation 认领 引用
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作者 Gang Xiang Jialin Liu Xiaolong Ma 《Natural Gas Industry B》 2025年第1期64-70,共7页
Milling bridge plugs in shale gas wells with severe casing deformation often leads to the accumulation of cuttings,increasing the risk of stuck drill bits.Friction in the wellbore further complicates tool deployment i... Milling bridge plugs in shale gas wells with severe casing deformation often leads to the accumulation of cuttings,increasing the risk of stuck drill bits.Friction in the wellbore further complicates tool deployment into the horizontal section,posing challenges to efficient plug drilling and achieving wellbore access to the target layer.This paper integrates the theory of positive displacement motors and models their actual working characteristics to study the milling of bridge plugs in severely deformed horizontal wells.It examines the effects of coiled tubing diameter and wall thickness on the bending load of horizontal sections and discusses key technical requirements,including the timing of plug drilling,extending the run in the horizontal section,parameter control,and real-time field analysis.Field practices have shown that after casing deformation occurs,priority should be given to drilling out the bridge plugs below the point of deformation.The primary factors contributing to stuck drills in deformed wells include smaller mill shoe sizes and larger cuttings sizes.Short well-washing cycles and targeted cuttings removal can effectively reduce sticking risks.If sticking occurs,high-tonnage pulling should be avoided.Instead,releasing the stick through up-anddown string motion,combined with high-volume nozzle spraying and annulus pumping,is recommended.The selection of coiled tubing should consider diameter,wall thickness,and steel grade to handle complex situations.Larger diameters,thicker walls,and low-frequency,multi-head hydraulic oscillators are more effective for unlocking horizontal sections.This approach can reduce the risk of drill sticking and solve the problem of horizontal section lock-ups,offering a reliable solution for smooth drilling and efficient production in wells with severe casing deformation. 展开更多
关键词 Shale gas Coiled tubing Casing deformation Milling bridge plug Risk control
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Soil Plug Effect Prediction and Pile Driveability Analysis for Large-Diameter Steel Piles in Ocean Engineering 认领 引用 被引量：19
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作者 刘润 闫澍旺 李志华 《China Ocean Engineering》 SCIE EI 2009年第1期107-118,共12页
Long steel piles with large diameters have been more widely used in the field of ocean engineering. Owing to the pile with a large diameter, soil plug development during pile driving has great influences on pile drive... Long steel piles with large diameters have been more widely used in the field of ocean engineering. Owing to the pile with a large diameter, soil plug development during pile driving has great influences on pile driveability and bearing capacity. The response of soil plug developed inside the open-ended pipe pile during the dynamic condition of pile-driving is different from the response under the static condition of loading during service. This paper addresses the former aspect. A numerical procedure for soil plug effect prediction and pile driveabihty analysis is proposed and described. By taking into consideration of the pile dimension effect on side and tip resistance, this approach introduces a dimensional coefficient to the conventional static eqnihbrium equations for the plug differential unit and proposes an improved static equity method for the plug effect prediction. At the same time, this approach introduces a simplified model by use of one-dimensional stress wave equation to simulate the interaction between soil plug and pile inner wall. The proposed approach has been applied in practical engineering analyses. Results show that the calculated plug effect and pile driveabihty based on the proposed approach agree well with the observed data. 展开更多
关键词 large diameter steel piles soil plug plug effect static equity method interaction between the plug and pile inner wall driveability analysis
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